Xu Lijia, Lin Zhicheng, Xiong XingYao, Cheng Huan, Kang ZhiLiang, Wang Yuchao, Wu Zhijun, Ma Wei, Yang Ning, He Yong, Zou Zhiyong, Liu Mingdan, Li Jianlong, Kou Xin, Zhao Yongpeng
College of Mechanical and Electrical Engineering, Sichuan Agricultural University, Ya'an 625014, China.
Institute of Urban Agriculture, Chinese Academy of Agricultural Sciences, Chengdu 610213, China.
Inorg Chem. 2023 Aug 21;62(33):13649-13661. doi: 10.1021/acs.inorgchem.3c02116. Epub 2023 Aug 10.
The development of a gas sensor capable of detecting ammonia with high selectivity and rapid response at room temperature has consistently posed a formidable challenge. To address this issue, the present study utilized a one-step solvothermal method to co-assemble α-FeO and SnO by evenly covering SnO nanoparticles on the surface of α-FeO. By controlling the morphology and Fe/Sn mole ratio of the composite, the as-prepared sample exhibits high-performance detection of NH. At room temperature conditions, a gas sensor composed of α-FeO@3%SnO demonstrates a rapid response time of 14 s and a notable sensitivity of 83.9% when detecting 100 ppm ammonia. Experiments and density functional theory (DFT) calculations suggest that the adsorption capacity of α-FeO to ammonia is enhanced by the surface effect provided by SnO. Meanwhile, the existence of SnO tailors the pore structure and effective surface area of α-FeO, creating multiple channels for the diffusion and adsorption of ammonia molecules. Additionally, an N-N heterostructure is formed between α-FeO and SnO, which enhances the potential energy barrier and improves the ammonia sensing performance. Demonstration experiments have proved that the sensor shows significant advantages over commercial sensors in the process of ammonia detection in agricultural facilities. This work provides new insights into the perspectives on ammonia detection at room temperature.
开发一种能够在室温下高选择性、快速响应地检测氨气的气体传感器一直是一项艰巨的挑战。为了解决这个问题，本研究采用一步溶剂热法，通过在α-FeO表面均匀覆盖SnO纳米颗粒，将α-FeO和SnO共组装。通过控制复合材料的形貌和Fe/Sn摩尔比，所制备的样品对NH表现出高性能检测。在室温条件下，由α-FeO@3%SnO组成的气体传感器在检测100 ppm氨气时，响应时间为14 s，灵敏度高达83.9%。实验和密度泛函理论（DFT）计算表明，SnO提供的表面效应增强了α-FeO对氨气的吸附能力。同时，SnO的存在调整了α-FeO的孔结构和有效表面积，为氨分子的扩散和吸附创造了多个通道。此外，α-FeO和SnO之间形成了N-N异质结构，增强了势能垒，提高了氨气传感性能。示范实验证明，该传感器在农业设施氨气检测过程中比商业传感器具有显著优势。这项工作为室温下氨气检测的研究提供了新的见解。
